Siloxane Hard Coating Resin Composition for Optical Films
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Solution Overview
Problem
Conventional hard-coating technologies for plastics face challenges in achieving high surface hardness and light transmittance while maintaining processability, as existing solutions either suffer from low abrasion resistance or result in decreased transmittance due to particle aggregation and oxygen sensitivity.
Innovation Solution
A siloxane resin composition with an alicyclic epoxy group is developed, featuring a weight-average molecular weight of 1,000 to 4,000 and a molecular weight distribution of 1.05 to 1.4, allowing for dense crosslinking and high surface hardness without oxygen sensitivity, achieved through chemical bonding of siloxane molecules with an inorganic material characteristic and an organic material characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic materials are used for hard-coating, then surface hardness is improved, but flexibility and processability deteriorate
Solution Approach 1:
The patent uses organic-inorganic hybrid siloxane materials that combine the high surface hardness of inorganic materials with the flexibility and processability of organic materials. The siloxane resin contains both organic functional groups and inorganic silicon-oxygen networks, creating a composite structure that achieves both hardness and ease of processing.
2Strength
If photo-radical polymerization of acrylate is used, then hard-coating can be achieved, but oxygen sensitivity increases requiring inert gas atmosphere
Solution Approach 1:
The patent replaces photo-radical polymerization of acrylate with alicyclic epoxy group polymerization, which does not have oxygen sensitivity. This substitution eliminates the need for inert gas atmosphere while still achieving hard-coating through crosslinking of the epoxy groups.
3Strength
If inorganic fine particles are physically mixed with resin, then surface hardness can be improved, but dispersibility decreases causing aggregation and light scattering
Solution Approach 1:
The patent merges inorganic and organic materials at the molecular level through chemical bonding in the siloxane structure, rather than physically mixing particles. The inorganic silicon-oxygen network is integrated into the organic resin matrix, creating uniform dispersion at the molecular level and preventing particle aggregation.
Solution Approach 2:
The patent changes the fundamental structure from physical particle mixing to chemical bonding, transforming the interaction between inorganic and organic components. This parameter change from physical to chemical level ensures uniform dispersion and prevents light scattering while maintaining surface hardness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The siloxane resin composition provides a hard-coating article with high surface hardness and transparency, suitable for optical films, while maintaining easy processability and avoiding the limitations of conventional methods.
Implementation Method 1
polymerization of the alicyclic epoxy group
Implementation Method 2
dense crosslinking during polymerization of the alicyclic epoxy group
Implementation Method 3
a siloxane molecule having an inorganic material characteristic is chemically bonded with an alicyclic epoxy group having an organic material characteristic
Data Source
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AI summary
The present application relates to a hard-coating resin composition including a siloxane resin, a preparing method of a siloxane cured hard-coating article using same and an optical film including the siloxane cured hard-coating article.